package com.itheima.reggie.filter;

import com.alibaba.fastjson.JSON;
import com.itheima.reggie.common.BaseContext;
import com.itheima.reggie.common.R;
import lombok.extern.slf4j.Slf4j;
import org.springframework.util.AntPathMatcher;

import javax.servlet.*;
import javax.servlet.annotation.WebFilter;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

/**
 * 检查用户是否已经完成登录
 */
@WebFilter(filterName = "loginCheckFilter",urlPatterns = "/*")
@Slf4j
public class LoginCheckFilter implements Filter {
    //路径匹配器，支持通配符
    public static final AntPathMatcher PATH_MATCHER=new AntPathMatcher();

    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
        HttpServletRequest request = (HttpServletRequest) servletRequest;
        HttpServletResponse response=(HttpServletResponse) servletResponse;
        //1.获取本次请求的URI
        String requestURI= request.getRequestURI();
        log.info("拦截到请求：{}",requestURI);
        //定义不需要处理的请求路径
        String[] urls =new String[]{
                "/employee/login",
                "/employee/logout",
                "/backend/**",
                "/front/**",
                "/common/**",
                "/user/sendMsg",//移动端发送短信
                "/user/login"//移动端登录
        };

        //2.判断本次请求是否需要处理
        boolean check = check(urls, requestURI);

        //3.不需要处理则直接放行

        if (check){
            log.info("请求不需要处理：{}",requestURI);
            filterChain.doFilter(request,response);
            return;
        }
        //4-1.判断登录状态，如果已登录则直接放行
        if (request.getSession().getAttribute("employee")!=null){
            log.info("用户已登录，用户ID为{}",request.getSession().getAttribute("employee"));

            Long empId =(Long) request.getSession().getAttribute("employee");
            BaseContext.setCurredId(empId);
            //Long id=Thread.currentThread().getId();

            //log.info("线程id为：{}",id);

            filterChain.doFilter(request,response);
            return;
        }

        //4-2.判断移动端用户登录状态，如果已登录则直接放行
        if (request.getSession().getAttribute("user")!=null){
            log.info("用户已登录，用户ID为{}",request.getSession().getAttribute("user"));

            Long userId =(Long) request.getSession().getAttribute("user");
            BaseContext.setCurredId(userId);
            //Long id=Thread.currentThread().getId();

            //log.info("线程id为：{}",id);

            filterChain.doFilter(request,response);
            return;
        }
        log.info("用户未登录");
        //5.如果未登录则返回未登录结果
        response.getWriter().write(JSON.toJSONString(R.error("NOTLOGIN")));
        return;


    }

    /**
     * 路径匹配，检查本次请求是否需要放行
     * @param urls
     * @param requestURI
     * @return
     */
    public boolean check(String[] urls,String requestURI){
        for (String url :urls) {//进行匹配
            boolean match =PATH_MATCHER.match(url,requestURI);
            if (match){
                return  true;
            }
        }
        return false;
    }
}
